Fire-pot and grate therefor.



. PATENIED FEB. 13, 1906.

A. R. HUBBARD & R. FLAY.- FIRE POT AND GRATE THEREFOR.

APPLICATION FILED DEG.7, 1905.

- Bermondsey, in the county UNTTBB STATES PATENT enrich.

ARTHUR ROBERT HUBBARD, OF BERMONDSEY. AND ROBERT FLAY, OF

COUNTY OF MIDDLESEX, ENGLAND.

Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed December 7,1905- Serial No. 290,769.

To all whom, it may concern.-

Be it known that we, ARTHUR ROBERT HUBBARD, engineer, of 181 Drumrnond road, of Surrey, and ROBERT FLAY, engineer, of 73 Gloucester street, in the county of MiddleseX, England, subjects of the King of Great Britain, have invented a new and useful Improvement in Fire-Pots and Grates Therefor, of which the following is a specification.

Our invention relates to improvements in fire-pots and grates therefor, the objects and advantages of whichwill appear from the following description, the particular features of novelty being succinctly stated in the claim.

In the accompanying drawin s, forming a part of this application and i lustrating a practical embodiment of same, Figure 1 is a view in plan of our improved fire-pot and grate therefor, and Fig. 2 is a central longitudinal sectional view.

Above the ash-pit a is arranged the grate, comprising a plurality of grate-bars (two being shown in the drawings) formed by the spaced sections g, provided on the spindles or shafts h h. These sections preferably are substantially of a triangular form helically disposed on the parallel shafts h h, the upper edge faces of the sections being of a lesser length than the side edge faces, the side edge faces terminating in a point at the bottom, as at g. The edge faces of the sections are of convex conformation, the configuration and arrangement of the sections being adapted to present a greater area for the air to travel through in its passage to the fire, and by this means the incoming air is highly and quickly heated as it is being drawn into the fire,giving greater heating power to the fuel during consumption.

The shafts h and h, which together with the sections g form the grate-bars, extend, as usual, from the front to the rear beneath the fire-pot, being suitablyjournaled, as at h", to rotate and provided at their rear ends with the squared shanks i i, geared together, as by the gear-wheels y' j, so that when one of the shafts is turned more or less by means of a crank is both shafts, with the sectional plates, are caused to rock more or less, the fuel resting on them being agitated to any desired extent.

Z designates a fire-pot disposed above the grate and provided on its inside face with vertical ribs m, forming guides or recesses m for a purpose hereinafter described. Surrounding the fire-pot is arranged an annular boiler n, 0, and 0, designating the inlet and outlet pipes for said boiler.

In order that the spaces at the sides and ends of the grate-bars when a cylindrical fire-pot is used shall not allow the fuel to fall through to the ash-pit, we arrange a movably-mounted ring p, having upon its outer periphery guiding lugs or projections q, arranged to freely fit in the guiding-recesses m, formed by the vertical ribs m of the fire-pot, as before described. Upon the inner peripheral edge of this ring there are cast short projections or teeth 1 r, the teeth 1" being adapted to extend between the spaced section-plates g, with the teeth 1" disposed adj acent the front and rear faces, respectively, of the front and rear section-plates g of the grate-bar, thus effectively closing the spaces necessarilyformed by the parallel grate-bars associated with a circular fire-pot.

s designates cams or projections formed on the ends of the shafts 7L and it. These cams are normally disposed downwardly, but are arranged in the path of the ring 79, so that upon rotation of the shafts 71 h they are brought into engagement with the lower face of the ring and elevate the latter simultaneously with the rocking movement of the section-plates g, the ring being guided vertically by the lugs q, disposed in the recesses WM, as heretofore described.

According to our invention, the operation of which is clear from the foregoing description, it will be obvious that the operation of shaking or keeping the grate clear is facilitated by the action and cooperation of the vertically-moving ring and the rotatable grate-bars.

Having thus fully described our invention, what we claim is- The combination of a lire-pot provided with Vertical grooves, a ring fitting the in- In witness whereof we have hereunto set terior of said fire-pot and provided with outour hands in the presence of two witnesses. wardly-extending teeth guided by said ARTHUR ROBERT HUBBARD. grooves, and rotary grate-bars situated be- ROBERT FLAY.

neath said ring and provided with cams Witnesses: adapted to raise said ring when said bars are ARTHUR E. EDWARDS, rotated, substantially as described. ALFRED T. BRATTON. 

